| The production and consumption of energy are the main factors leading to CO2 emissions,and actively promoting emission reduction and carbon reduction in the energy sector is a key measure to achieve the "double carbon" target.The integrated energy system couples the energy networks of electricity,gas and heat sup ply,which can improve energy utilization efficiency and promote the consumption of distributed renewable energy,and is one of the important ways to realize the green transformation of energy structure in China.However,the uncertain fluctuation of large-scale high-penetration renewable energy and energy-using load poses a great challenge for the safe and reliable operation of the system,and the unit scheduling plan formulated by conventional deterministic optimization analysis method has the risk of supply-demand imbalance,which will cause economic loss to the system and affect the normal energy consumption of residents.Therefore,this paper aims to improve the theoretical method of schedul ing decision of integrated energy system,improve the efficien cy of energy utilization,so as to further improve the benefits of comprehensive economic and social development.In order to promote the safe and reliable operation of the integrated energy sys tem,improve the economic performance and low carbon performan ce of the optimal scheduling decision of the integrated energy system.This paper conducts research from the perspectives of dynamic planning,energy utili zation,energy utilization and market trading that take into account the source-load uncertainties,so as to systematically improve the whole chain optimization capability of the integrated energy system from long-term planning to short-term scheduling.The main research work includes:(1)A dynamic planning method of integrated energy system with constru ction timing is proposed to address the problems of poor equ ipment utilization and poor supply reliability in one-time investment planning of the system.This paper analyzes the energy hub input-output relationship,builds a refined model of coupled equipm ent and each energy network in the system,and characterizes the complex interactions between multiple energy carriers;the uncertainty of renewable energy and load is portrayed by box uncertainty set,and the dynamic planning model of the system is established with the objective of minimizing the whole-life cost;the original model is decomposed into a two-stage robust by using the Big M method and dual theory,and the two-stage robust optimization model is solved using the column and constraint generation algorithm to obtain the equipment allocation scheme for eac h planning time period;based on the actual data from Arizona State University,it is verified that the new investment equipment capacity of the dynamic planning method can match the load growth rate in different periods and reduce the planning and constru ction cost of the system.(2)In order to address the problem of insufficient carbon capture level during peak-load hours in the process of decarbonization of the rmal power units,a low-carbon economic dispatching strategy of integrated energy system based on flexible response of supply and demand is proposed from the perspective of energy utilization.This paper analyzes the operation mechanism of organic Rankine cycle waste heat recovery power generation technology and realizes the supply-side flexible response of heat and power output of combined heat and power units;introduces incentive-based electric load demand response and heat load demand response based on heating comfort ambiguity;establishes a data-driven distributed robust model to solve the source-load uncertainty problem in the system;unites the 1-norm and∞-norm constraints limit the uncertainty probability distribution confidence set,and use the column and constraint generation algorithm to solve the optimization model to obtain the unit start-stop plan and output configuration scheme of the integrated energy system;based on the integrated energy arithmetic case formed by 39-node power system,20-node natural gas network and 6-node thermal system,it is verified that the flexible supply-demand response strategy effectively de couples the cogeneration unit’s thermoelectric output,and enhances the carbon efficiency of the system by improving the energy utilization efficiency enhances the carbon capture capacity of the system.(3)In order to address the problems of insufficient consumption of new energy with high permeability and lack of regulation flexibility,a low-carbon and economic dispatching strategy of integrated energy system based on hydrogen blending and oxygen-rich deep regulation of gas network is proposed from the perspective of energy utilization.The paper establishes a two-stage refinement model of the electricity-to-gas link,considering the electrolytic water reaction in the electrolyzer and the Sabatier reaction in the methanation equipment respectively;proposes the energy utilization paths of hydrogen blending and oxygen-rich deep regulation in the gas network,considering hydrogen blending in to the gas network to supply the gas units and oxygen-rich units to enter the oxygen-rich deep regulation state;establishes a data-driven distributed robust model to solve the source-load based on the improved multi-node integrated energy algorithm,it is verified that the hydrogen-oxygen energy utilization model can broaden the ap plication scope of green and clean energy,improve the flexibility of the system,and reduce the carbon emission of the system by improving the utilization of hydrogen-oxygen energy.(4)In order to address the problems of incomplete carbon emission trajec tory and unclear trading risks,a low-carbon economic dispatching strategy of integrated energy system considering life-cycle analysis of carbon emission and ladder carb on trading is proposed from the perspective of market trading.This paper analyzes the coupling mechanism of carbon capture and electricity-to-gas conversion,gets the transfer law of different energy flows,and establishes a model of integrated energy system with carbon capture-electricity-to-gas coupling;analyzes the carbon emissions generated by the migration and transformation processes of different energy chains through the whole-life analysis method,and introduces the normalized measured carbon emission coefficients into the ladder carbon trading mechanism model to further constrain the carbon emissions of the integrated energy system;uses the conditional value risk theory to control the system operation risk,and the day-ahead scheduling strategy of the system is obtained;based on the improved multi-node integrated energy sytem,it is verified that the ladder carbon trading mechanism based on the whole-life analysis can comprehensively measure the carbon emission trajectories of different energy chains from production,transmission to utilization,which enhances the guiding effect of carbon trading mechanism on the emission reduction of enterprises. |
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